Preliminary investigation of a magnetically insulated relativistic backward wave oscillator operating in the C-band with low magnetic field

Wang, Huida; Xiao, Renzhen; Chen, Changhua; Shi, Yanchao; Zhang, Guangshuai

doi:10.1063/5.0001893

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…However, a strong guiding magnetic field increases the volume, weight, and energy consumption of an HPM system. Low-magnetic field HPM sources with small volumes, weights, and energy consumption have wide application prospects [13], [14], [15], [16].…”

Section: Gw Was Obtained In Experiments With Amentioning

confidence: 99%

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Deng

Dang

et al. 2023

IEEE Access

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With an increase in the input power of a low-magnetic field and high-efficiency transit-time oscillator, the deceleration electric field in the single-gap extractor increases sharply to output a higher-power microwave, resulting in radio frequency breakdown on the surface of the single-gap extractor. Thus, a doublegap extractor with an operating mode of π mode is introduced to reduce the electric field in this type of device. The double-gap extractor can extract electron energy in two stages and lengthen the deceleration distance. Therefore, the electron beam loses less energy at the same deceleration distance in the double-gap extractor, and a weaker deceleration electric field is generated in the double-gap extractor. Additionally, the modulation electric field in the device with a double-gap extractor is stronger for modulating electrons and can further increase the fundamental harmonic current, resulting in higher extraction efficiency. In simulations, the output power is 6.3 GW and the maximum electric field strength is 1.06 MV/cm in the initial model with a single-gap extractor. When the single-gap extractor is replaced by the double-gap extractor, the output power increases to 6.5 GW with a conversion efficiency of 40% and a guiding magnetic field of 0.6 T. The maximum electric field strength decreases to 817 kV/cm, indicating an enhancement in the power capacity of the device.INDEX TERMS High-power microwaves, transit-time oscillator, improved power capacity, deceleration electric field.

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Section: Gw Was Obtained In Experiments With Amentioning

confidence: 99%

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Deng

Dang

et al. 2023

IEEE Access

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“…FIGURE 1(a) shows a conventional KL-RBWO, which has an annular cathode, a resonant reflector (RR), non-uniform SWSs, and an extractor. The fundamental parameters of this conventional KL-RBWO are chosen to be similar to those in reference [17], except for the guiding magnetic field. The magnetic induction intensity is 0.32 T in this case, and the magnetic field in this case declines more rapidly behind the extractor.…”

Section: Structure Model and Theoretical Analysismentioning

confidence: 99%

“…However, these attempts and efforts were carried out mainly in RBWOs where IREBs are constrained with strong magnetic field. For a conventional RBWO operating at a magnetic-field strength below that of the cyclotron resonance, the beam-wave conversion efficiency obtained is generally lower than 30% [13][14][15][16][17][18]. In order to further promote the conversion efficiency, we propose a novel HPM generator based on KL-RBWO.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Enhancement of a Klystron-Like Relativistic Backward Wave Oscillator With Waveguide Reflection and Bunching Promotion

Wang

Xiao²,

Shi³

et al. 2020

IEEE Access

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A klystron-like relativistic backward-wave oscillator (KL-RBWO) with transverse electron beam confinement and waveguide reflection, which works well under a magnetic-field strength below that of the cyclotron resonance, is proposed. For this device operating with a low magnetic field, effective suppression of the transverse velocity of electron beams is introduced by a local electric field near the tube head, to promote modulation uniformity of electron beams. Part of the reflected microwave from the output waveguide provides feedback enhancement to the extractor, which strengthens the local standing-wave field. Owing to a stronger electric field that can interact with the electron beam in the extractor and a higher growth of fundamental harmonic current, the efficiency of the KL-RBWO is increased to 40% when guided by a magnetic field of 0.32 T, compared with that of 30% using conventional structures.INDEX TERMS High power microwaves, intense relativistic electron beams, relativistic backward-wave oscillator, Cherenkov radiation

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“…In recent years, there have been many research reports in this area. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] A transit-time oscillator (TTO) is a type of HPM source that has the potential to be miniaturized and compact due to its simple structure, which can work efficiently with a low external guiding magnetic field. This kind of device has attracted increasing interest from researchers.…”

Section: Introductionmentioning

confidence: 99%

Experimental research based on a C-band compact transit-time oscillator with a novel diode loading an embedded soft magnetic material and shielding structure

Ling

et al. 2023

Chinese Phys. B

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In order to reduce the external magnetic field and improve the conversion efficiency of high-power microwave generation devices with low external magnetic field, a novel diode with embedded soft magnetic and shielding structure is proposed. The soft magnetic material is designed to enhance the local magnetic field in the diode region. Besides, the diode applies a shielding structure which can reduce the radial electric field. From simulation research, it is found that the emission and transmission quality of the electron beam with low magnetic field is greatly improved when loading this diode. Through simulation research, it is verified that the diode can increase the conversion efficiency of the TTO from 30% to 36.7%. In our experimental study, under the conditions of a diode voltage of 540kV and a current of 10.5kA, the output microwave power is 1.51GW when loading the novel diode and the microwave frequency is 4.27GHz when an external guiding magnetic field of 0.3T is applied. The corresponding conversion efficiency is improved from 20.0% to 26.6%, which is 6.6% higher than the device loaded with a conventional diode. Our experiments have verified that this novel diode can effectively improve the conversion efficiency of high-power microwave sources operating with low magnetic field, and contribute to the miniaturization and compactness of high-power microwaves.

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Preliminary investigation of a magnetically insulated relativistic backward wave oscillator operating in the C-band with low magnetic field

Cited by 11 publications

References 19 publications

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Improved Power Capacity in a Low-Magnetic Field and High-Efficiency Transit-Time Oscillator by a Double-Gap Extractor

Efficiency Enhancement of a Klystron-Like Relativistic Backward Wave Oscillator With Waveguide Reflection and Bunching Promotion

Experimental research based on a C-band compact transit-time oscillator with a novel diode loading an embedded soft magnetic material and shielding structure

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